Malicious PDF — malware analysis report

Static analysis result for SHA-256 646a238c550e40d9…

MALICIOUS

PDF

84.4 KB Created: 2021-04-02 07:20:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c53ab013d0313462c16cf4f19a997853 SHA-1: dff1d281e25e24dca6eecec375ac5e16d731ac6d SHA-256: 646a238c550e40d9c712cc90abeade0ed7adcf73c5afe543afb9729736c2b401
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are SEO-optimized to appear as legitimate search results. The primary URL, 'https://jumiwimov.ru/wix?keyword=tai+kung+six+secret+teachings+pdf', suggests a phishing or malware distribution attempt disguised as a document download. ClamAV and ML classifiers also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=tai+kung+six+secret+teachings+pdf
    • http://lamakexo.scienceontheweb.net/practicing_active_and_passive_voice_worksheet_answer_key.pdf
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/030e62.pdf
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/17e9668a.pdf
    • http://tepoparupomo.medianewsonline.com/munebito.pdf
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/fabodudapatilil.pdf
    • https://zasubimivari.weebly.com/uploads/1/3/1/3/131383839/jaratufenepa-wowig-kafudavaze.pdf
    • https://cdn.sqhk.co/mekibekowufe/jifJyic/general_sniper_nationality.pdf
    • https://cdn.sqhk.co/koxixoneto/UkmjL4v/air_attack_2_mod_apk_1._3._0.pdf
    • https://rusopanuguxixat.weebly.com/uploads/1/3/4/6/134640346/tejuz.pdf
    • https://cdn.sqhk.co/dikizumi/ggjenSm/vuwanidexo.pdf
    • https://rosavipufek.weebly.com/uploads/1/3/5/3/135315232/ropegezapoduka-wufujaz-mosutodunoji-digamezadasuwe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_902503caba9b48de9e59ff9458364e8b.pdf?index=true
    • http://nujugeteteda.myartsonline.com/alyaum_newspaper.pdf
    • https://uploads.strikinglycdn.com/files/e1d31970-0043-4245-b31e-5f98873041fa/54018225859.pdf
    • https://5ccda086-29c7-4024-8a93-689df1f3b89c.filesusr.com/ugd/ed8107_d8a11a062dd447a8b8620e70824fe922.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0b9a0429-e788-4795-bb8d-879e12a20694/is_the_little_princess_a_true_story.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_e8526d1925c8459782ffdc8a3d4289ef.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed98.bin
8c041910a5f646a76ce1630a72904d9408e8744687e6a1fa9e521114c18bac65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED98 4264 bytes
font_01_sfnt_off0000fc78.bin
a7ab95a8fa6bb0d8f8200f21381348586fbddb616273b8587244dffb5e8d09dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 5236 bytes
font_02_sfnt_off00010e42.bin
2b8ccb048b330e870671c24e53e448bb271b93884b7e62523cf121a8defca914		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 11392 bytes
font_03_sfnt_off0001342c.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1342C 4324 bytes

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